I have an LG Ally. I have a market SMS popup app that lets me customize the quick text, but that only works if someone texts you first and it pops up. Sometimes I need to sent a quick text to someone that hasn't texted me first, such as "driving" or "call you in a minute". The stock quick texts on the Ally messaging app are pretty lame, and I haven't been able to figure out a way to customize them.